Update csunplugged/static/js/plugging-it-in-walkthrough.js
Update csunplugged/static/js/plugging-it-in-walkthrough.js

Co-authored-by: Alasdair Smith <f8acbcd4a70960492d16ad46263a1127df368d12@gmail.com>
uccser/cs-unplugged,uccser/cs-unplugged,uccser/cs-unplugged,uccser/cs-unplugged